Bilthoven weather in April
In April, Bilthoven sees average daytime highs of 14°C and overnight lows near 5°C, with 51 mm of precipitation across 11.3 wet days and about 13.6 hours of daylight. It is the 7th-warmest and 12th-wettest month of the year here.
Highs climb over the month, from about 12°C in the first days to 16°C by the end. The sky is clear or mostly clear about 20% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 36 min at the start of April to 14 h 30 min by month's end. Set against the rest of the year, April is Bilthoven's 2nd-clearest and 8th-windiest month. For the whole year in context, see Bilthoven's year-round climate.
- Daytime high
- 14°
- 7th warmest
- Overnight low
- 5°
- 6th coldest
- Precipitation
- 51 mm
- 11.3 wet days
- Daylight
- 13 h 36 min
- 5:51 AM – 7:28 PM
- Cloud cover
- 66%
- 2nd clearest
- Wind
- 14 km/h
- 8th windiest
- Solar energy
- 4.25 kWh/m²
- Travel score
- 3.8
- out of 10
Bilthoven is village in the Netherlands.
- Air quality
- Elevated
- PM2.5 16.4 µg/m³ · 2010
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 12°C in the first days to 16°C by the end.
A typical April day in Bilthoven reaches about 14°C in the afternoon and slips back to 5°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 20°C. Set against its neighbours, April runs about 4°C warmer than March and about 4°C cooler than May.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 16 |
| Avg low (°C) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 12 | 4 |
| 2 | 12 | 4 |
| 3 | 12 | 4 |
| 4 | 12 | 4 |
| 5 | 12 | 4 |
| 6 | 12 | 4 |
| 7 | 12 | 4 |
| 8 | 13 | 4 |
| 9 | 13 | 5 |
| 10 | 13 | 5 |
| 11 | 13 | 5 |
| 12 | 13 | 5 |
| 13 | 13 | 5 |
| 14 | 13 | 5 |
| 15 | 14 | 5 |
| 16 | 14 | 5 |
| 17 | 14 | 5 |
| 18 | 14 | 5 |
| 19 | 14 | 6 |
| 20 | 15 | 6 |
| 21 | 15 | 6 |
| 22 | 15 | 6 |
| 23 | 15 | 6 |
| 24 | 15 | 6 |
| 25 | 15 | 7 |
| 26 | 15 | 7 |
| 27 | 15 | 7 |
| 28 | 16 | 7 |
| 29 | 16 | 7 |
| 30 | 16 | 7 |
How April really feels in Bilthoven
Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Bilthoven weather by month
How April compares with the rest of the year at a glance. April is the 7th-warmest and 12th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 6° / 1° | 64 | 12.6 | 1.2 | 8 | 0.3 |
| Feb | 6° / 1° | 54 | 10.7 | 1.5 | 9.5 | 0.6 |
| Mar | 10° / 3° | 55 | 11.5 | 0.8 | 11.5 | 2.0 |
| Apr | 14° / 5° | 51 | 11.3 | 0.1 | 13.6 | 3.8 |
| May | 17° / 9° | 63 | 11.8 | 0 | 15.4 | 5.3 |
| Jun | 20° / 12° | 67 | 11.7 | 0 | 16.4 | 5.8 |
| Jul | 22° / 14° | 82 | 14.1 | 0 | 16 | 6.0 |
| Aug | 22° / 14° | 81 | 13.1 | 0 | 14.4 | 6.0 |
| Sep | 19° / 11° | 67 | 12 | 0 | 12.4 | 5.5 |
| Oct | 14° / 8° | 65 | 12 | 0 | 10.4 | 3.8 |
| Nov | 9° / 5° | 61 | 12.3 | 0.3 | 8.5 | 1.8 |
| Dec | 6° / 2° | 70 | 13.1 | 1.3 | 7.6 | 0.5 |
Cloud cover in April
The sky is clear or mostly clear about 20% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 16% of April, with mostly cloudy or overcast conditions the remaining 64%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 34 | 34 | 34 | 35 | 34 | 34 | 35 | 34 | 34 | 34 | 36 | 36 | 37 | 37 | 38 | 39 | 39 | 39 | 39 | 39 | 39 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 35 |
| Cloudier (%) | 66 | 66 | 66 | 65 | 66 | 66 | 65 | 66 | 66 | 66 | 64 | 64 | 63 | 63 | 62 | 61 | 61 | 61 | 61 | 61 | 61 | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 64 | 65 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 34 | 66 |
| 2 | 34 | 66 |
| 3 | 34 | 66 |
| 4 | 35 | 65 |
| 5 | 34 | 66 |
| 6 | 34 | 66 |
| 7 | 35 | 65 |
| 8 | 34 | 66 |
| 9 | 34 | 66 |
| 10 | 34 | 66 |
| 11 | 36 | 64 |
| 12 | 36 | 64 |
| 13 | 37 | 63 |
| 14 | 37 | 63 |
| 15 | 38 | 62 |
| 16 | 39 | 61 |
| 17 | 39 | 61 |
| 18 | 39 | 61 |
| 19 | 39 | 61 |
| 20 | 39 | 61 |
| 21 | 39 | 61 |
| 22 | 37 | 63 |
| 23 | 37 | 63 |
| 24 | 37 | 63 |
| 25 | 37 | 63 |
| 26 | 36 | 64 |
| 27 | 36 | 64 |
| 28 | 36 | 64 |
| 29 | 36 | 64 |
| 30 | 35 | 65 |
Chance of precipitation in April
Bilthoven gets around 51 mm of rain and snow over 11.3 wet days in April, the driest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 37% and peaks near 41% on the wettest days, and about 0 day brings snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 35 | 35 | 35 | 35 | 35 | 36 | 36 | 37 | 37 | 38 | 38 | 39 | 39 | 39 | 40 | 40 | 40 | 41 |
| Rain chance (%) | |
|---|---|
| 1 | 37 |
| 2 | 37 |
| 3 | 37 |
| 4 | 37 |
| 5 | 37 |
| 6 | 37 |
| 7 | 37 |
| 8 | 37 |
| 9 | 36 |
| 10 | 36 |
| 11 | 36 |
| 12 | 36 |
| 13 | 35 |
| 14 | 35 |
| 15 | 35 |
| 16 | 35 |
| 17 | 35 |
| 18 | 36 |
| 19 | 36 |
| 20 | 37 |
| 21 | 37 |
| 22 | 38 |
| 23 | 38 |
| 24 | 39 |
| 25 | 39 |
| 26 | 39 |
| 27 | 40 |
| 28 | 40 |
| 29 | 40 |
| 30 | 41 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 99 | 99 | 99 | 99 | 99 | 99 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 100 | 0 |
| 2 | 100 | 0 |
| 3 | 100 | 0 |
| 4 | 100 | 0 |
| 5 | 100 | 0 |
| 6 | 100 | 0 |
| 7 | 100 | 0 |
| 8 | 100 | 0 |
| 9 | 100 | 0 |
| 10 | 100 | 0 |
| 11 | 100 | 0 |
| 12 | 100 | 0 |
| 13 | 100 | 0 |
| 14 | 100 | 0 |
| 15 | 100 | 0 |
| 16 | 100 | 0 |
| 17 | 100 | 0 |
| 18 | 100 | 0 |
| 19 | 100 | 0 |
| 20 | 100 | 0 |
| 21 | 100 | 0 |
| 22 | 100 | 0 |
| 23 | 100 | 0 |
| 24 | 100 | 0 |
| 25 | 99 | 1 |
| 26 | 99 | 1 |
| 27 | 99 | 1 |
| 28 | 99 | 1 |
| 29 | 99 | 1 |
| 30 | 99 | 1 |
Wind in April
Winds average 14 km/h in April.
Across April, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 15 | light breeze |
| 2 | 15 | light breeze |
| 3 | 15 | light breeze |
| 4 | 15 | light breeze |
| 5 | 15 | light breeze |
| 6 | 14 | light breeze |
| 7 | 14 | light breeze |
| 8 | 14 | light breeze |
| 9 | 14 | light breeze |
| 10 | 14 | light breeze |
| 11 | 14 | light breeze |
| 12 | 14 | light breeze |
| 13 | 14 | light breeze |
| 14 | 14 | light breeze |
| 15 | 14 | light breeze |
| 16 | 14 | light breeze |
| 17 | 14 | light breeze |
| 18 | 14 | light breeze |
| 19 | 14 | light breeze |
| 20 | 14 | light breeze |
| 21 | 14 | light breeze |
| 22 | 14 | light breeze |
| 23 | 14 | light breeze |
| 24 | 14 | light breeze |
| 25 | 14 | light breeze |
| 26 | 14 | light breeze |
| 27 | 14 | light breeze |
| 28 | 14 | light breeze |
| 29 | 14 | light breeze |
| 30 | 14 | light breeze |
Sunrise & sunset in April
Daylight runs from about 12 h 36 min at the start of April to 14 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 114 minutes over April. Sunrise moves from 6:26 AM to 5:21 AM, and sunset from 7:02 PM to 7:52 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.6 | 12.7 | 12.7 | 12.8 | 12.9 | 12.9 | 13.0 | 13.1 | 13.2 | 13.2 | 13.3 | 13.4 | 13.4 | 13.5 | 13.6 | 13.6 | 13.7 | 13.8 | 13.8 | 13.9 | 14.0 | 14.0 | 14.1 | 14.1 | 14.2 | 14.3 | 14.3 | 14.4 | 14.5 | 14.5 |
| Sunrise (AM) | 6:26 | 6:23 | 6:21 | 6:19 | 6:16 | 6:14 | 6:11 | 6:09 | 6:07 | 6:04 | 6:02 | 6:00 | 5:58 | 5:55 | 5:53 | 5:51 | 5:48 | 5:46 | 5:44 | 5:42 | 5:40 | 5:37 | 5:35 | 5:33 | 5:31 | 5:29 | 5:27 | 5:25 | 5:23 | 5:21 |
| Sunset (PM) | 7:02 | 7:04 | 7:05 | 7:07 | 7:09 | 7:11 | 7:12 | 7:14 | 7:16 | 7:18 | 7:19 | 7:21 | 7:23 | 7:25 | 7:26 | 7:28 | 7:30 | 7:32 | 7:33 | 7:35 | 7:37 | 7:39 | 7:40 | 7:42 | 7:44 | 7:46 | 7:47 | 7:49 | 7:51 | 7:52 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.6 | 6:26 | 7:02 |
| 2 | 12.7 | 6:23 | 7:04 |
| 3 | 12.7 | 6:21 | 7:05 |
| 4 | 12.8 | 6:19 | 7:07 |
| 5 | 12.9 | 6:16 | 7:09 |
| 6 | 12.9 | 6:14 | 7:11 |
| 7 | 13.0 | 6:11 | 7:12 |
| 8 | 13.1 | 6:09 | 7:14 |
| 9 | 13.2 | 6:07 | 7:16 |
| 10 | 13.2 | 6:04 | 7:18 |
| 11 | 13.3 | 6:02 | 7:19 |
| 12 | 13.4 | 6:00 | 7:21 |
| 13 | 13.4 | 5:58 | 7:23 |
| 14 | 13.5 | 5:55 | 7:25 |
| 15 | 13.6 | 5:53 | 7:26 |
| 16 | 13.6 | 5:51 | 7:28 |
| 17 | 13.7 | 5:48 | 7:30 |
| 18 | 13.8 | 5:46 | 7:32 |
| 19 | 13.8 | 5:44 | 7:33 |
| 20 | 13.9 | 5:42 | 7:35 |
| 21 | 14.0 | 5:40 | 7:37 |
| 22 | 14.0 | 5:37 | 7:39 |
| 23 | 14.1 | 5:35 | 7:40 |
| 24 | 14.1 | 5:33 | 7:42 |
| 25 | 14.2 | 5:31 | 7:44 |
| 26 | 14.3 | 5:29 | 7:46 |
| 27 | 14.3 | 5:27 | 7:47 |
| 28 | 14.4 | 5:25 | 7:49 |
| 29 | 14.5 | 5:23 | 7:51 |
| 30 | 14.5 | 5:21 | 7:52 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 4.25 kWh/m².
For context, solar energy here swings from a low near 0.56 kWh/m² to a high of 5.26 kWh/m² in June across the year — April's 4.25 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.5 | 3.6 | 3.6 | 3.7 | 3.7 | 3.8 | 3.9 | 3.9 | 4.0 | 4.0 | 4.1 | 4.1 | 4.2 | 4.3 | 4.3 | 4.4 | 4.4 | 4.5 | 4.5 | 4.5 | 4.6 | 4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 3.5 | Moderate |
| 2 | 3.6 | Moderate |
| 3 | 3.6 | Moderate |
| 4 | 3.7 | Moderate |
| 5 | 3.7 | Moderate |
| 6 | 3.8 | Moderate |
| 7 | 3.9 | Moderate |
| 8 | 3.9 | Moderate |
| 9 | 4.0 | Moderate |
| 10 | 4.0 | Bright |
| 11 | 4.1 | Bright |
| 12 | 4.1 | Bright |
| 13 | 4.2 | Bright |
| 14 | 4.3 | Bright |
| 15 | 4.3 | Bright |
| 16 | 4.4 | Bright |
| 17 | 4.4 | Bright |
| 18 | 4.5 | Bright |
| 19 | 4.5 | Bright |
| 20 | 4.5 | Bright |
| 21 | 4.6 | Bright |
| 22 | 4.6 | Bright |
| 23 | 4.6 | Bright |
| 24 | 4.6 | Bright |
| 25 | 4.7 | Bright |
| 26 | 4.7 | Bright |
| 27 | 4.7 | Bright |
| 28 | 4.7 | Bright |
| 29 | 4.7 | Bright |
| 30 | 4.7 | Bright |
Is April a good time to visit Bilthoven?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a weaker month for outdoor sightseeing in Bilthoven.
What to pack for Bilthoven in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Bilthoven sees daytime highs around 14°C and nights near 5°C. Worth packing: a warm layer and rain gear. About 11 days see rain.
Sea temperature near Bilthoven in April
The nearest coast averages about 9°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 56 km away) is warmest in August at about 19°C and coldest in February near 5°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 6 | 5 | 6 | 9 | 12 | 15 | 18 | 19 | 18 | 15 | 11 | 8 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 5 | Bracing |
| Mar | 6 | Bracing |
| Apr | 9 | Bracing |
| May | 12 | Bracing |
| Jun | 15 | Bracing |
| Jul | 18 | Cool |
| Aug | 19 | Cool |
| Sep | 18 | Cool |
| Oct | 15 | Bracing |
| Nov | 11 | Bracing |
| Dec | 8 | Bracing |
UV index in Bilthoven in April
Clear-sky midday UV in April peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Bilthoven peaks around July 15 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 21 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 4 | 5 | 6 | 6 | 6 | 4 | 2 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | Moderate | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 5 | Moderate |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 6 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Air quality in Bilthoven in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Bilthoven is worst in March — around 20 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 12 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Bilthoven's WHO annual average of 16.4 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 16 | 20 | 20 | 19 | 18 | 16 | 18 | 16 | 14 | 13 | 12 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 16 | Moderate |
| Mar | 20 | Moderate |
| Apr | 20 | Moderate |
| May | 19 | Moderate |
| Jun | 18 | Moderate |
| Jul | 16 | Moderate |
| Aug | 18 | Moderate |
| Sep | 16 | Moderate |
| Oct | 14 | Moderate |
| Nov | 13 | Moderate |
| Dec | 12 | Moderate |
Where is Bilthoven?
Bilthoven sits at 52.1°N, 5.2°E, 6 m above sea level, in The Netherlands. The nearest listed city is Zeist, 5.0 km away.
Topography around Bilthoven
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bilthoven.
Within 3 km, the terrain around Bilthoven has only modest variations in elevation — a maximum elevation change of 30 m around an average of 10 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 83 m; within 80 km, only modest variations in elevation — a maximum elevation change of 140 m.
The land around Bilthoven is covered by trees (68%) within 3 km, trees (39%) and grassland (35%) within 16 km, and grassland (34%) and water (20%) within 80 km.
The Netherlands travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 84% of US
- price level, 2025
- GDP per capita
- $73,684
- 2025
- Happiness
- 7.2 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2023
- Road deaths
- 4
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 624
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Bilthoven (52.13°, 5.2014°, elevation 6 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).